Process for dividing diamonds.



ST. JOHN WOOD. PROGESS FOR mvmme DIAMONDS.

- APPLIOATI IION IILED HAY 3. 1906.

W/TNESSES INVENTOR .9. I B) I Am 777; M. W

A TTOHNEYS PATENTED DEC. 25, 1906.

ST. JOHN jwoon. OF VNE'WIYORK, 'N. 'Y,

".PRocEss oe HDIVIDING DIAMONDS..-

I Specification of Letters Patent. Application filed Hay3,190 6. Serial no. 315.109.

' Patented Dec. 25,1906.

To all whom, it may concern:

Be it known that 1-, ST. JOHN Wool), of New York, in the county of New York, and

' in the State'of New York, have invented a 4s its greatest advantage.

, of a slice B from a sma is divided into only two .slices, as illustrated 5o diamonds to certain new and useful Improvement in Processes for Divlding Diamonds; and I do hereby declare that t and exact description thereof, reference be ing had to the accompanying drawings, in

Fi ure 1 is arough diamond or crystal divide into slices or wases. Fig. 2 is a view of the inner face of a slice or. was; and Figs. 3, 4, and 5 areviews of the inner faces of slices or wases of different proportions.

' In the preparation of diamonds for sale to Lewelers and consumers it is not alwa s feasile to finish up each rough diamond 1nto the largest gem that is possible to make there from, but because the demand for the larger gems is comparatively small it is necessary to divide a large proportion of the rou h form a number of smaller dlamonds from each rough diamond.

I-have discovered that I can saw from dif-' ferent sides of a rough diamond and can make the saw cuts meet at any desired angle and that by'dis osi-ng the saw cuts according to certain met rods which I have invented, which this discovery makes possible, I can divide the diamond to such advantage that. thereresults a most important increase in the weight of the finished diamonds from a given rough diamond or crystal, and that my process does not in the least impair the pnrit or affect the value of the diamond. n practicing my invention I prefer first to divide the crystal into slices or wases,

there; being two or more, according to the size of the crystal. In Fig. 1 I haveillustrated a crystal divided into two slices or- Wases.

These slices may be made by cleaving or sawing. .It is-in dividing the slices into the blocks from which the finished gems are to-be formed that my process applies to Iwill first apply my process to the division ler crystal A, such as in Fi 1, A view of theinner face of the slice is illustrated in Fig. 2. Inthis case I choose a center point. C and make three sawcuts-D C, E C, and F- 0, all meeting in the point C. I thus get three 'blocks'from the said slice, which, are of such advantageous 1e following-is a full, clear,-

- like manner the other two, N and three slices G, H, and I, (or more, if desired,)

and I will now state how the upper slice Gis divided, supposin asillustrated in=Fig. 3, the three'p'rinci a edges of its inner face to be of substantially equal length. I lay off in the middle portion a triangular block and tially perpendicular to the 'edges of the slice I and meeting at an angle of the triangular then make saw cuts'I K and I L substan-.

block. The block M isthus removed. In

O of the three corner-blocks are removed. Then the saw cuts I P,P Q, and Q I are made, separating the blocks R, S, and T from the cen-- tral block U, and thedivision'of the slice is com lete. I

ere, as illustrated in Fig.4, the slice has two long sides and a-short one, owing to the distortion of thecr stal I proceed as in the case illustrated in ig. 3, except that on each of the long sides I form two rectangular blocks instead of one on each side, as in Fig. 3, the was 'inother'respects being sawed as in Fig. 3.- I

Where, as illustrated in Fig. 5, the slice is very much elongated, I omit "the central trianghlar block, as appears in Fig. .3, and form two rectangular blocks w and w on each side and a block mat the apex, two blocks formed at the base of the tria le.,

-It is obvious that various 0 anges can be made in the above-illustrated process, which will be within the spirit of m invention, and I desire not to be limited to t e details I have illustrated; a 1

I claim 1 1. The process of mondto form a plurality of smaller diamonds, which process consists in sawing partially into the body of such larger diamond from y being a dividing a larger dieopposite sides, said saw cuts meet' at an :00

angle, to form blocks from which sma er diamonds can be formed.

2. The process of dividing a slice, or was,

of a diamond to form smaller diamonds,

which consists in sawing partially into the body of the slice from opposite sides, said saw cuts meeting ,at an angle to form blocks from which said smaller diamonds can be formed.

3. The process of dividing a slice, or was, i no of a diamond to form smaller diamonds, which process consists in sawingaplurality of cuts to a central point.

4. The process of dividing a slice, or was, of a larger diamond to form smaller diamonds, which process consists in sawing from the edges of the slice to the apexes'of a triangular block to be formed from the center, thus cutting three blocks from the corners of the slice, and separating blocks along the sides of the triangular block.

5. The process of dividing aslice, or was, of a larger diamond to form smaller diamonds, which process consists in sawing out a four-sided block at a corner of the slice, and dividing the remainder of the slice into blocks.

6. The process of dividing a slice or was of a larger diamond to form smaller diamonds, which process consists in sawing the peri heral portions of the slice into blocks for orming smaller diamonds, the peripheral portions bein divided from the central portion of the s ice by saw cuts substantially parallel to the outer edges of the slice, which saw cuts are at an angle to each other so as to form of sa1d central portion a triangular block.

7. The process of dividing a triangular slice or was of a larger diamond to form smaller diamonds, which process consists in making cuts substantially perpendicular to the edges of the slice, and making cuts substantially parallel to the edges of the slice, whereby a triangular block is formed from the central portion of the slice or was.

8. The process of di'vidinga slice, or was, of a larger diamond to form smaller diamonds, which consists in forming a block for a smaller diamond by divisions starting on opposite sides of a corner and meeting at an angle to each other, and dividing the remainder of the slice.

9. The process of dividing aslice, or was, of a larger diamond to form smaller diamonds, which consists in forming a block for a smaller diamond by sawing cuts starting on opposite sides of a corner and meeting at an an le to each other, and dividing the remainder of the slice.

In testimony that 1 claim the foregoing l have hereunto set my hand.

ST. JOHN WOOD.

Witnesses:

' llENRY H. W001),

EDWIN J. PRINDLE. 

